This kit allows for up to 4 devices to be
attached to a single 75 ohm video
output from TV related devices. A
typical situation would be attaching an
HDD and an analog TV to a digital TV
set. The gain of the FK655 is adjustable
using an on-board potentiometer.
Specifications:
power requirement : 12VDC
Input/output impedance: 75 ohms
Current consumption :
150mA@Vin=2.5Vp-p, 1kHz.
Adjustable Gain : approx. 1-4dB
PCB dimensions : 2.17" x 2.88"
How it works Requires a 12V power supply 200mA minimum. Diode D1 acts as a polarity
reversal protection and three-pin voltage regulator, IC1, steps down the input
voltage to +9V for the circuit to operate from. Capacitor C1 C3 are power
supply filter capacitors.
The video signal is fed through VIDEO IN and capacitor
C4 to transistors TR1 and TR2, which amplify the video signal. With VR1 used to
adjust the bias of TR1 and VR2 is used to adjust the gain of the video amplifier. A
video amplifier is fed to the base of TR3-TR6, which increase the available driver
current for each channel (via VIDEO OUT).
Earning 1point for this item
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